Hurricane Willa, an "extremely dangerous" storm heading to Mexico's Pacific coast, was upgraded to Category 4 by the National Hurricane Center late Sunday.

The storm, with maximum sustained winds of 145 mph, is about 210 miles away from Cabo Corrientes, a municipality in southwest Mexico. The storm is moving north-northwest at 7 mph, according to the NHC's latest advisory.

A growing crowd of Central American migrants in southern Mexico resumed its advance toward the U.S. border on Sunday. The advances have overwhelmed Mexican officials' attempts to stop them at the border.

The Associated Press reports that the number of migrants swelled to about 5,000 overnight.

On Saturday, President Trump told reporters the migrants were "hardened criminals."

Congolese rebels killed 15 civilians and abducted a dozen children in an attack at the center of the latest deadly Ebola outbreak, Congo's military said Sunday. The violence has threatened to again force the suspension of crucial virus contamination efforts.

The Allied Democratic Forces rebels, a Ugandan Islamist militant group active in the area since the 1990s, attacked Congolese army positions and several neighborhoods of Beni on Saturday and into Sunday, Capt. Mak Hazukay Mongha told The Associated Press.